Feeling Upset

It looks like your MIL felt guilty for not helping you that night. And, you are also not fully recovered having given birth and dealing with an infant with hormone swings. Don't make long term decisions based on these short term encounters. If you still feel annoyed about this 6 months from now .. then yeah, may be worth discussion. Till then, use all your free time with your new baby .. which school do you plan for him/her / where will you celebrate first year birthday party etc etc